File "electrum\gui\qt\main_window.py", line 747, in timer_actions
  File "electrum\gui\qt\main_window.py", line 1434, in do_update_fee
  File "electrum\gui\qt\main_window.py", line 1595, in read_send_tab
  File "electrum\gui\qt\main_window.py", line 1581, in get_send_fee_estimator
  File "electrum\gui\qt\amountedit.py", line 126, in get_amount
  File "electrum\util.py", line 584, in quantize_feerate